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Cookbook/Compilers and interpreters

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(GHCi: reloading)
(debugging)
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== GHCi ==
 
== GHCi ==
  +
  +
=== General ===
   
 
{| class="wikitable"
 
{| class="wikitable"
Line 74: Line 76:
 
|<haskell>
 
|<haskell>
 
Prelude> :r
 
Prelude> :r
  +
</haskell>
  +
|}
  +
  +
=== Debugging ===
  +
  +
{| class="wikitable"
  +
|-
  +
! Problem
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! Solution
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! Examples
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|-
  +
| setting a break point
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| :break
  +
|<haskell>
  +
Prelude> :break 2 -- sets a break point in line 2
 
</haskell>
 
</haskell>
 
|}
 
|}

Revision as of 08:31, 25 January 2010

Contents

1 GHC

Problem Solution Examples
compiling and linking an executable --make
ghc --make Main.hs               --> Main
compiling without linking -c
ghc -c Foo.hs                    --> Foo.hi, Foo.o
generating Assembler code -S
ghc -S Foo.hs                    --> Foo.hi, Foo.s
generating C code -C
ghc -C Foo.hs                    --> Foo.hc, Foo.hi
linking files into an executable -o
ghc -o test Foo.o Bar.o Baz.p    --> test

2 GHCi

2.1 General

Problem Solution Examples
checking a definition  :i
Prelude> :i Monad
class Monad m where
  (>>=) :: m a -> (a -> m b) -> m b
  (>>) :: m a -> m b -> m b
  return :: a -> m a
  fail :: String -> m a
        -- Defined in GHC.Base
instance Monad Maybe -- Defined in Data.Maybe
instance Monad IO -- Defined in GHC.IOBase
instance Monad ((->) r) -- Defined in Control.Monad.Instances
instance Monad [] -- Defined in GHC.Base
checking a type  :t
Prelude> :t "Hello"
"Hello" :: [Char]
 
Prelude> :t length
length :: [a] -> Int
loading a file  :l
Prelude> :l Foo.hs
[1 of 1] Compiling Foo              ( Foo.hs, interpreted )
Ok, modules loaded: Foo.
reloading all loaded files  :r
Prelude> :r

2.2 Debugging

Problem Solution Examples
setting a break point  :break
Prelude> :break 2    -- sets a break point in line 2

3 Hugs

TODO